UNIX for Dummies Questions & Answers

can any one please help me how to use "read" command for openig a file.i want to process the file record by record and then needs to search for a particular string at a particular position.can any one please let me know the code.i am new to the shell.

below are sample sample records

D6303200805066HJ8164-61002EURO6303I0073554514
D6303200805066HJ8164-61002EURO6303I0073554514

your help would appreciate.....


thanks
rao.

read simply reads standard input. You probably want to use redirection.

Code:

while read line; do
  echo "Read line '$line'"
done <file

Without concrete information about which particular string at which particular position, it's hard to do anything useful inside that loop, but it should hopefully be enough to get you started.

thanks ray.
i have seen the below code.but i am not getting wht the "line" signifies in the read command?i am very new to unix scripting.could you please write elabrately somethign in the code.
coming to search pattern i have to search at 14and15 postion of the record whether it equals to '6h' or not.if so i have to write that coressponding record into a separate file.

i really appreciate your help.

advancedthanks
narasimharao.

If that's all you need, read is not really appropriate.

Code:

egrep '^.{13,14}6h' file >separatefile

(Or 6H if that's what you really mean; grep and friends are case sensitive by default. Add the -i option to ignore case distinctions.)

read variablename reads a line of input, which is subsequently available in $variablename -- you can of course call your variables anything you like.

("ray", huh? Had't come across that particular one before ...)